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E*(Ohl COMPANY, U.S.A. <br /> -i P.O. SOX 4415 - <br /> ... - HODS TONY TEXAS 77210-4415 - - <br /> . MARKEr1NG DEPARTMENT <br /> REAL ESTATE & ENGINEER INC <br /> MAP I <br /> r <br /> March 9, 1987 � NVlRUrrE tiTal HEALTH <br /> �(PERMIT/SERVICES <br /> Ms. Laurie COtulla <br /> San Joaquin Local Health District <br /> P. 0. Box 2009 ry <br /> Stockton, California 95201 <br /> ` Subject: Former Exxon Location 7-1050 <br /> s 909 W. Hammer Lane; Stockton <br /> bear Laurie: <br /> sc <br /> Attached is a report containing the results of the additional site assessment <br /> t' at the referenced site. The investigation was performed by our consultant ' <br /> Groundwater Technology and designed to determine the impact of the suspected <br /> hydrocarbon release on the subsurface soil and ground water. This <br /> 1 investigation follows the removal of the underground storage tanks and initial <br /> assessment at the site. <br /> One soil boring was drilled through the backfill material of the old tankfield <br /> and converted to a ground water monitoring well . Soil samples were collected <br /> at five foot intervals and monitored with -3 photoionization (PID) meter. <br /> Samples were selected based on their PID readings and analyzed for for total <br /> 1 petroleum hydrocarbons (TPH) and benzene, toluene and xylene (BTX). Ground <br /> water samples collected from the new monitoring well and the two monitoring a <br /> wells installed during the initial site assessment were also analyzed for TPH H <br /> and BTX. <br /> No free productwas encountered during the investigation but, TPH and BTX <br /> concentrations above the action levels were found in a Portion of <br /> oil <br /> samples and in the ground water samples. Ground water nalysis oftthe he swater <br /> .`_ from the new monitoring well located higher concentration on of TPH and BTX'-than <br /> in_the_existing, welIs.--This -indicates the source of any hydrocarbon release <br /> was probably in the tankfield area <br /> z i <br /> rl <br /> A DryfSfON OF EXXON CORPORA TION <br /> a :5 <br /> t <br /> Fi <br /> r <br />